Hey Harv,
I keep the Outlook Express folder inside the Explorer folder and transfer it into the new IE 5.1.7 folder.
There was a “Java message log” and “Microsoft Internet Self-Repair” folder in the old IE 5.1.3 folder that I transferred as well. I also exchanged the IE alias in the Apple menu items folder, in the system folder. I'll run it for a week or so, then trash the old 5.1.3 folder, then search for any old aliases and replace them with updates.
I have everything backed up as usual, twice, so if there is any conflict or missing in action files I can just drag and drop the old 5.1.3 folder with out skipping a beat or an